hsejar,
Attached is a modified version of your workbook. First I turned the supplier number and name input cells in sheet1 cells C4 and C5 into drop-down lists using data validation. The lists refer to named ranges that are specified on Sheet2. In order to fill them, I used advanced filter -> copy to range -> unique only. I then set the combobox properties ColumnCount to 2 and TextColumn to 2 so that the combobox displays both the Material Number and Material Name and when an item is selected the combobox shows the Material Name. The rest is done via the Sheet1 Worksheet_Change event in VBA:
Hope that helps,
~tigeravatar
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